(Cam Position Censor) CPS problem on engine swap. Please Help!

[redbaron1988]

Hey Guys,

Okay... I have a 1997 Eclipse GST Auto FWD. I threw a rod through the block and so now I am doing an engine swap. I bought a used engine off the internet from Canada which is the 2g 4g63 turbo (like mine) to replace it. Anyway, some things are different on the new motor... Intake manifold, that kind of thing. Everything has swaped over from the old motor until now. I noticed that the old motor has the cam position censor (CPS) on the rear, passenger side of the of the cam, but there is just a plug blocking this spot on the new motor. I took the valve covers of both motors and took the plate off the CPS on the old motor. I unbolted the magnet from inside the censor and saw there was a threaded hole in the cam. I figured the new motor would have the same thing and that I could just swap the censor over, but the new motor's cam only has the slots for the magnet and no threaded hole to bolt the magnet in. What is the best thing for me to do at this point. Is there another censor that does the same thing on the new motor that I can just splice my harness into, or do I have to swap the cams? If I have to swap the cams, Are they interchangable? I know this is long, but I am at a loss. Please help

 

[luv2rallye]

Sounds like the new engine is a 95 or 96 which has the cam sensor on the gear end behind the intake gear (http://www.dsmtuners.com/forums/attachment.php?attachmentid=57673&d=1131787540). Read this: http://www.dsmtuners.com/forums/newbie-forum/205188-96-98-cams.html

 

[InvaderGSX]

Cams are the same. You can either take the cam out of your old engine and swap it or you can tap the cam. Tapping the cam is pretty easy. Would be easier than swapping the entire cam. You don't want to use the cam gear style CAS as it was a crappy design and that is why they changed it. That style is only on 95 and 96's. When they go out you have to do so much to replace it. The 97 style is better and rarely go bad. Plus if decide to keep the 95 CAS you'll have to wire in that sensor, take a chance it is not bad, and then swap your plug wires. Like where 1 and 4 are supposed to go has to go where 2 and 3 as they are reversed.

 

[redbaron1988]

Okay, so it seems like the tapping is the way to go... my concern with that is weather or not it will effect the balance or integrity of the cam. If I rout to swap the cams, what all is involved?

 

[InvaderGSX]

Your not going to ruin the cam by tapping it. It won't ruin it at all. If you swap the cam you just have to undo your timing belt, take off your valve cover, and undo the bolts for the cam caps and your cam will come out. You do not need to take the cam gear off. Just keep it on. Not really that hard unless you have a complete long block ready to drop on with the timing belt still complete then it wouldn't be worth messing with all that.

 

[redbaron1988]

Okay... Thanks guys! I wound up tapping the cam. In case anyone wants to know, it's an 8mm 1.25 tap that needs to be used. I used a couple small pilot bits but finished with a 9/36 drill bit before tapping.